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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Merge.java @ 2804:095162a84dcc

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Introduced scheduling code.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Fri, 27 May 2011 18:44:13 +0200
parents 6a1e5d7e1f4e
children c3f64b66fc78
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.ir;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.util.*;
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28 import com.sun.c1x.value.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * Denotes the beginning of a basic block, and holds information
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33 * about the basic block, including the successor and
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34 * predecessor blocks, exception handlers, liveness information, etc.
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35 */
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36 public class Merge extends StateSplit {
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37
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38 private static final int INPUT_COUNT = 0;
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39
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40 private static final int SUCCESSOR_COUNT = 0;
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41
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42 @Override
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43 protected int inputCount() {
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44 return super.inputCount() + INPUT_COUNT;
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45 }
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46
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47 @Override
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48 protected int successorCount() {
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49 return super.successorCount() + SUCCESSOR_COUNT;
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50 }
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51
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52 @Override
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53 public boolean needsStateAfter() {
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54 return false;
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55 }
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56
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57 /**
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58 * Constructs a new Merge at the specified bytecode index.
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59 * @param bci the bytecode index of the start
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60 * @param blockID the ID of the block
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61 * @param graph
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62 */
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63 public Merge(Graph graph) {
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64 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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65 }
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66
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67 protected Merge(int inputCount, int successorCount, Graph graph) {
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68 super(CiKind.Illegal, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
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69 }
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70
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71 @Override
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72 public void accept(ValueVisitor v) {
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73 v.visitMerge(this);
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74 }
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75
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76 @Override
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77 public String toString() {
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78 StringBuilder builder = new StringBuilder();
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79 builder.append("merge #");
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80 builder.append(id());
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81 builder.append(" [");
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82
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83 builder.append("]");
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84
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85 builder.append(" -> ");
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86 boolean hasSucc = false;
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87 for (Node s : this.successors()) {
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88 if (hasSucc) {
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89 builder.append(", ");
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90 }
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91 builder.append("#");
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92 if (s != null) {
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93 builder.append(s.id());
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94 } else {
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95 builder.append("null");
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96 }
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97 hasSucc = true;
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98 }
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99
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100 return builder.toString();
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101 }
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102
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103 public void printWithoutPhis(LogStream out) {
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104 // print block id
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105 out.print("B").print(id()).print(" ");
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106
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107 // print flags
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108 StringBuilder sb = new StringBuilder(8);
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109 if (sb.length() != 0) {
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110 out.print('(').print(sb.toString()).print(')');
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111 }
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112
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113 // print block bci range
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114 out.print('[').print(-1).print(", ").print(-1).print(']');
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115
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116 // print block successors
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117 //if (end != null && end.blockSuccessors().size() > 0) {
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118 out.print(" .");
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119 for (Node successor : this.successors()) {
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120 if (successor instanceof Value) {
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121 out.print((Value) successor);
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122 } else {
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123 out.print(successor.toString());
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124 }
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125 }
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126 //}
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127
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128 // print predecessors
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129 if (!blockPredecessors().isEmpty()) {
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130 out.print(" pred:");
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131 for (Instruction pred : blockPredecessors()) {
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132 out.print(pred.block());
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133 }
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134 }
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135 }
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136
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137 @Override
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138 public void print(LogStream out) {
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139
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140 printWithoutPhis(out);
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141
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142 // print phi functions
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143 boolean hasPhisInLocals = false;
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144 boolean hasPhisOnStack = false;
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145
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146 //if (end() != null && end().stateAfter() != null) {
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147 FrameState state = stateBefore();
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148
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149 int i = 0;
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150 while (!hasPhisOnStack && i < state.stackSize()) {
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151 Value value = state.stackAt(i);
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152 hasPhisOnStack = isPhiAtBlock(value);
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153 if (value != null && !value.isIllegal()) {
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154 i += value.kind.sizeInSlots();
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155 } else {
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156 i++;
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157 }
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158 }
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159
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160 for (i = 0; !hasPhisInLocals && i < state.localsSize();) {
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161 Value value = state.localAt(i);
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162 hasPhisInLocals = isPhiAtBlock(value);
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163 // also ignore illegal HiWords
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164 if (value != null && !value.isIllegal()) {
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165 i += value.kind.sizeInSlots();
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166 } else {
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167 i++;
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168 }
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169 }
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170 //}
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171
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172 // print values in locals
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173 if (hasPhisInLocals) {
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174 out.println();
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175 out.println("Locals:");
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176
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177 int j = 0;
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178 while (j < state.localsSize()) {
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179 Value value = state.localAt(j);
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180 if (value != null) {
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181 out.println(stateString(j, value));
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182 // also ignore illegal HiWords
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183 j += value.isIllegal() ? 1 : value.kind.sizeInSlots();
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184 } else {
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185 j++;
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186 }
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187 }
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188 out.println();
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189 }
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190
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191 // print values on stack
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192 if (hasPhisOnStack) {
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193 out.println();
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194 out.println("Stack:");
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195 int j = 0;
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196 while (j < stateBefore().stackSize()) {
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197 Value value = stateBefore().stackAt(j);
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198 if (value != null) {
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199 out.println(stateString(j, value));
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200 j += value.kind.sizeInSlots();
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201 } else {
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202 j++;
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203 }
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204 }
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205 }
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206
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207 }
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208
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209 /**
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210 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block.
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211 *
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212 * @param value the instruction to test
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213 * @param block the block that may be the join block of {@code value} if {@code value} is a phi
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214 * @return {@code true} if {@code value} is a phi and its join block is {@code block}
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215 */
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216 private boolean isPhiAtBlock(Value value) {
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217 return value instanceof Phi && ((Phi) value).block() == this;
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218 }
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219
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220
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221 /**
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222 * Formats a given instruction as a value in a {@linkplain FrameState frame state}. If the instruction is a phi defined at a given
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223 * block, its {@linkplain Phi#valueCount() inputs} are appended to the returned string.
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224 *
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225 * @param index the index of the value in the frame state
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226 * @param value the frame state value
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227 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its
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228 * {@linkplain Phi#block() join point}
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229 * @return the instruction representation as a string
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230 */
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231 public String stateString(int index, Value value) {
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232 StringBuilder sb = new StringBuilder(30);
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233 sb.append(String.format("%2d %s", index, Util.valueString(value)));
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234 if (value instanceof Phi) {
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235 Phi phi = (Phi) value;
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236 // print phi operands
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237 if (phi.block() == this) {
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238 sb.append(" [");
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239 for (int j = 0; j < phi.valueCount(); j++) {
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240 sb.append(' ');
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241 Value operand = phi.valueAt(j);
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242 if (operand != null) {
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243 sb.append(Util.valueString(operand));
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244 } else {
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245 sb.append("NULL");
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246 }
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247 }
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248 sb.append("] ");
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249 }
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250 }
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251 return sb.toString();
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252 }
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253 }